package com.jd.tran;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.message.MessageExt;

import java.nio.charset.StandardCharsets;
import java.util.List;

/**
 *消息消费者
 */

public class Consumer {

    public static void main(String[] args) throws Exception {
        // 1.创建消费者对象，指定消费者组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("tran_group");
        // 2.连接mq
        consumer.setNamesrvAddr("127.0.0.1:9876");
        // 4.消费者订阅主题，表示此消费者消费哪个主题的消息，二级分类可以是*
        consumer.subscribe("tran_topic", "tran_tags");
        // 5.注册监听器
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                try {
                    for (MessageExt msg : msgs) {
                        String result = new String(msg.getBody(), StandardCharsets.UTF_8);
                        System.out.println(result);
                    }
                    // 标记该消息已经被成功消费
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                } catch (Exception e) {
                    e.printStackTrace();
                }

                // 消费失败
                return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }
        });
        // 3.启动消费者
        consumer.start();
    }

}